I had to buy a Fax Modem for Windows 2003 Fax server. Many of my old USR Ext modems did not work out, so I bought a Zoom Mini Fax Modem 3095 from Staples.
It just would not say if it will support my Windows 2003 Server. I finally said what the hey, and installed on one, and it works.
So all of you out there, this modem works on windows 2003 server.